Add more tests for https://github.com/dotnet/roslyn/pull/76083

src/Analyzers/CSharp/Tests/ImplementInterface/ImplementInterfaceTests.cs

@@ -24,7 +24,7 @@ namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.ImplementInterface;
 [Trait(Traits.Feature, Traits.Features.CodeActionsImplementInterface)]
 public sealed class ImplementInterfaceTests
 {
-    private readonly NamingStylesTestOptionSets _options = new NamingStylesTestOptionSets(LanguageNames.CSharp);
+    private readonly NamingStylesTestOptionSets _options = new(LanguageNames.CSharp);
 
     private static OptionsCollection AllOptionsOff
         => new(LanguageNames.CSharp)
@@ -602,6 +602,54 @@ public void Method1()
             """);
     }
 
+    [Theory, CombinatorialData, WorkItem("https://github.com/dotnet/roslyn/issues/26323")]
+    public async Task TestMethodWhenClassBracesAreMissing2(
+        [CombinatorialValues(0, 1)] int behavior)
+    {
+        await new VerifyCS.Test
+        {
+            TestCode = """
+                using System;
+
+                namespace WPFConsoleApplication1
+                {
+                    class Program
+                    {
+                        private class Test : {|CS0535:ICloneable|}{|CS1513:|}{|CS1514:|}
+
+                        static void Main(string[] args) { }
+                    }
+                }
+                """,
+            FixedCode = """
+                using System;
+
+                namespace WPFConsoleApplication1
+                {
+                    class Program
+                    {
+                        private class Test : ICloneable
+                        {
+                            public object Clone()
+                            {
+                                throw new NotImplementedException();
+                            }
+                        }
+
+                        static void Main(string[] args) { }
+                    }
+                }
+                """,
+            Options =
+            {
+                new OptionsCollection(LanguageNames.CSharp)
+                {
+                    { ImplementTypeOptionsStorage.InsertionBehavior, (ImplementTypeInsertionBehavior)behavior }
+                }
+            }
+        }.RunAsync();
+    }
+
     [Fact]
     public async Task TestInheritance1()
     {